patch 4.0

src/sql/engine/expr/ob_expr_pl_seq_nextval.cpp

@@ -0,0 +1,134 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#define USING_LOG_PREFIX SQL_ENG
+
+#include "sql/engine/expr/ob_expr_pl_seq_nextval.h"
+#include "sql/engine/ob_exec_context.h"
+#include "lib/mysqlclient/ob_mysql_result.h"
+#include "sql/engine/ob_physical_plan_ctx.h"
+#include "sql/engine/expr/ob_expr_util.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "share/sequence/ob_sequence_cache.h"
+#include "share/schema/ob_schema_getter_guard.h"
+
+namespace oceanbase
+{
+using namespace common;
+using namespace share;
+namespace sql
+{
+ObExprPLSeqNextval::ObExprPLSeqNextval(ObIAllocator &alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_PL_SEQ_NEXT_VALUE, N_PL_SEQ_NEXTVAL, 1, NOT_ROW_DIMENSION,
+                         false, INTERNAL_IN_ORACLE_MODE)
+{
+}
+
+
+ObExprPLSeqNextval::~ObExprPLSeqNextval()
+{
+}
+
+
+int ObExprPLSeqNextval::calc_result_type1(ObExprResType &type,
+                                      ObExprResType &type1,
+                                      ObExprTypeCtx &type_ctx) const
+{
+  UNUSED(type_ctx);
+  int ret = OB_SUCCESS;
+  if (!type1.is_uint64()) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("input param should be uint64_t type", K(type1), K(ret));
+  } else {
+    type.set_number();
+    type.set_scale(ObAccuracy::DDL_DEFAULT_ACCURACY[ObNumberType].scale_);
+    type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY[ObNumberType].precision_);
+    type.set_result_flag(NOT_NULL_FLAG);
+  }
+  return ret;
+}
+
+int ObExprPLSeqNextval::get_schema_guard(ObExecContext *exec_ctx, 
+                                         share::schema::ObSchemaGetterGuard *&schema_guard) const
+{
+  int ret = OB_SUCCESS;
+  schema_guard = NULL;
+  if (OB_ISNULL(exec_ctx)) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("task executor context is NULL", K(ret), KP(exec_ctx));
+  } else if (OB_ISNULL(schema_guard = exec_ctx->get_sql_ctx()->schema_guard_)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("schema guard is NULL", K(ret));
+  }
+  return ret;
+}
+
+int ObExprPLSeqNextval::cg_expr(
+    ObExprCGCtx &op_cg_ctx, const ObRawExpr &raw_expr, ObExpr &rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(op_cg_ctx);
+  UNUSED(raw_expr);
+  CK (1 == rt_expr.arg_cnt_);
+  OX (rt_expr.eval_func_ = eval_pl_seq_next_val);
+  return ret;
+}
+
+int ObExprPLSeqNextval::eval_pl_seq_next_val(
+    const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
+{
+  int ret = OB_SUCCESS;
+  share::ObSequenceCache &seq_cache = share::ObSequenceCache::get_instance();
+  ObSQLSessionInfo *session = ctx.exec_ctx_.get_my_session();
+  share::schema::ObSchemaGetterGuard *schema_guard = NULL;
+  ObDatum *datum = NULL;
+  CK (OB_NOT_NULL(session));
+  CK (1 == expr.arg_cnt_);
+  OZ (expr.args_[0]->eval(ctx, datum));
+  CK (OB_NOT_NULL(datum));
+  CK (OB_NOT_NULL(schema_guard = ctx.exec_ctx_.get_sql_ctx()->schema_guard_));
+  if (OB_FAIL(ret)) {
+  } else {
+    uint64_t tenant_id = session->get_effective_tenant_id();
+    int64_t seq_id = datum->get_int();
+    ObEvalCtx::TempAllocGuard alloc_guard(ctx);
+    const share::schema::ObSequenceSchema *seq_schema = nullptr;
+    if (OB_FAIL(schema_guard->get_sequence_schema(tenant_id,
+                                                  seq_id,
+                                                  seq_schema))) {
+      LOG_WARN("fail get sequence schema", K(seq_id), K(ret));
+    } else {
+      ObSequenceValue seq_value;
+      if (OB_FAIL(seq_cache.nextval(*seq_schema,
+                                    alloc_guard.get_allocator(),
+                                    seq_value))) {
+        LOG_WARN("fail get nextval for seq", K(tenant_id), K(seq_id), K(ret));
+      } else if (OB_FAIL(session->set_sequence_value(tenant_id, seq_id, seq_value))) {
+        LOG_WARN("save seq_value to session as currval for later read fail",
+                  K(tenant_id), K(seq_id), K(seq_value), K(ret));
+      } else { /*do nothing*/ }
+      if (OB_SUCC(ret)) {
+        common::number::ObNumber tmp;
+        ObNumStackOnceAlloc tmp_alloc;
+        if (OB_FAIL(tmp.from(seq_value.val(), tmp_alloc))){
+          LOG_WARN("fail deep copy value", K(ret), K(seq_id));
+        } else {
+          expr_datum.set_number(tmp);
+        }
+      }
+    }
+  }
+  return ret;
+}
+
+}//end namespace sql
+}//end namespace oceanbase